Radio receiver



May 25, 19137. E. pEvlENNE RADIO RECEIVERl Filed oct. 26. 1935 afa Patented May 25, 1937 UNITED STATES PATENT OFFICE In France October 3l, 1934 ing the ground wire of the receiver, preferably divided into a plurality of elements arranged inshunt, in the eld created by the two conductors which connect lthe receiver with the source of electricity, these conductors being advantageously arranged in such manner as to form a coil, which is movable with respect to said ground wire.

l` The effect obtained through this arrangement,

which is chieyimportant when the current fed to the receiver is alternating current, corresponds to an increase of the sonorityand selectivity of the radio receiver, wherebythe emissions from stations normally received are translated more clearly` and strongly, while it is possible to receive emissions from stations which could not be received otherwise The arrangement according to the present in y vention is particularlyuseful in the following conditions:

1. when the receiving ser is but muc selective;v

2. In the case of a receiver of any kind whatever when said receiver is located in'a place which is not favorable to the reception of waves. As a matter of fact, it often occurs, at least in the case of'radio receivers fed with current. from an electric distribution system, that a receiver place and in most of the surrounding places,

works in a defective manner in certain other places. v l

` Furthermore, the arrangement according to 4o in other cases, through an inverse adjustment,

the emission of a station located at a'shortV distance and'which is too powerful. c

' According to the. present invention none of the elements of the receiving set vis modified. Of course an arrangement according to the invention may be added in a permanent manner to the receiving set. But this arrangement may also be Y removable, so that, in order to improve any receiveri,'it suffices to replace the double conductor which connects the receiver with the source of electricity by the arrangement according to the invention.

It is "ery advantageous to devise the system in such manner that the. distance between the which works in a satisfactory manner in a given the present invention makes it possible to weaken.

ground wire and the double wire through which` current is fed to the receiver may be adjustable. In order to increase the action of this double conductor on the ground wire, this double conductor should preferably be wound so as to make a certain number of turns, in order to create a suilicient field of induction in the vicinity of the ground wire. g v

If this winding, instead of including both of the wiresthrough which current is fed to the receiver, includes only one of these conductors, only poorvandeven doubtful results are obtained. If, close to this winding, a winding is made with the ground wire, thusforming two reactive coils located in front of each other, unsatisfactory results are also obtained. c

Other features of the present invention will v result from `the following description of kspecic embodiments of the invention.

Preferred embodiments of the present invention will be hereinafterdescribed. with reference to lthe accompanying drawing, given merely by way lof example, and in which:

Fig. 1 is a top view of the device accordingto the present invention, the upper wall of the box that contains thisdevice having been removed;

Fig. 2 is a correspondingside view;

Figs. 3 and 4 are perspective'viewso f a modication in which the ground wire consists of several elements arranged in shunt. f

The device shown in Figs. 1 and 2 shows a box or casing I, provided, on one of its walls with a metallic wire 2., similar to those usually employed as ground wires.- This wire must be bare. Its two ends are in contact with terminals 3, 3, respectively` 5 which extends through a milled knob 6 provided with inner threads in engagement -with those of the screw, this knob being mounted to turn freely on the side of box I located opposite A movable plate 4 carries a screw the wall that carries wire 2. With this arrangement, by turning knob 6, plate 4 is caused to move toward, or away from, wire 2. In order to'guidethe displacements of .this plate 4, two fiat pro-- longed parts 1, 1, xed to the end's of said plate, are engaged in slots 8, 8, provided in the walls of the box. Oneof these slots is visible in Fig. 2.

The movable .plate 4 is surrounded by several turns of the insulated double ywire 9 through whichcurrent isfed tothe receiver, these two wires being located side by side against the plate. Fig. 1 shows one of these turns. The double conductor 9 enters and leaves the box at IB, I0, re`

spectively. Knob 6 carries, in the usual manner a pointer Il. movable in front of a graduated enne. (not visib1e on thedrawing) so as to measure the displacements of movable plate 4'.

When making use of this device, the double conductor 9 is connected, on the one hand, with,v

the source of electricity, and, on the other hand, with the radio receiver. Then one of the termivn'als is connected to the ground terminal lof the receiver andthe other one to any structure (water pipe, etc.) leading to the ground. A In order to ob-4 tain the best possible results,itis'generally neces'- sary to have Wire 2 at a verysmall distance from the turns formed by double `conductor 9, but said Wire 2 should notbeiin contact with the insulat-v wire, a plurality of elements or wires 2S, 2a,

-be obtained.

2, ofl a non-magnetic metal, extending from the outer face of plate la, through holes I2, l2, I2 provided throughout said plate. On the outer face of this plate (Figu 4), these wires, x'ed by means of clips I3, I3, I3, of a non-magnetic metal, have their respective ends connected to a weld block I4, I4, provided at either end, said blocks being in contact with terminals I5, I5. In these terminals are engaged the ends of the two portions I6, I 6 of the ground wire, one of these portions being in Contact with the ground terminal of the radio receiver, and the other one `with the ground.

It. should be noted that wires 28l must be disposed parallelly to the turns formed by the winding of the double wire through which current is .has been given merely by way of example. However, it is importantl that the winding formed by the feed wires should include both conductors and not only one of them, if good results are to In a general manner, while IV have, in the above description, disclosed what I deem to be practical and emcient embodiments of the present invennon, it should be well understood thaf/ r do not wish to be limited thereto as there might-be changes made in the arrangement, disposition and form of the parts, without departing from the principle of the present invention as comprehended within the scope o1 the appended claims.

What I claim is: 1. In a radio receiver arranged to be fed with electric current from a source of electricity, the

, combination of a winding formed by a double conductor connecting said receiver with said source, a ground wire for said receiver extending through vthe field created by said winding, and means for moving said winding and said ground wire with respect to each other, for adjustment purposes.

' 2. `A device for use with a radio receiver adapted to be fed with electric current from an external source of electricity, which comprises, in

`combination, a double conductor forming a wind- 3. A devicefor use with a radio receiver adapted to be fed with electric current from lan external source of electricity and includinga ground wire and a double conductor for'connecting said receiver with said source of electricity, which comprises, in combination, a plurality of wire elements connected together in shunt arranged to be inserted in said ground Wire, and a winding formed of a double wire adapted to be inserted in series in said double conductor, disposed in close proximity of said wire elements.

4. A device for use with a radio receiver adapted to be fed with electric current from an external' isource of electricity and'including a ground wire and a double conductor'forconnecting said receiver with said source'of electricity, which comprises, in combination, a pluralityvof "wire elements connected together in shunt, means for inserting the whole of said wire elements in series in said ground wire, a winding formed of a double Wire and the turns of which are parallel to said wire elements, means for inserting said winding in series in said double conductor, and means for adjusting the relative position of said Winding and said plurality of wire elements connected in shunt. v

EMILE DEVIENNE. 

